Regional Wastewater System Biofilter Project

This project will construct an improved and cost-efficient system for effectively reducing sewer odors and preventing corrosion in manholes and sewer pipes.

Project Overview

Two independent sewer pipelines that serve the City of Battle Ground and over 7,300
homes in Clark County merge into a single
pipeline along Salmon Creek Avenue. These
pipelines generate odors that are currently
being mitigated using several different treatment
processes.

This project will construct a new biofilter that
incorporates the latest technology to collect and
treat the odorous air and minimize long term
corrosion. Engineered biofilter media and a new
air line connection to the sewer pipes will greatly
increase the effectiveness of the new filter. The
new filter will replace the existing facility south
of Salmon Creek Avenue and east of Interstate
205.

The biofilter is estimated to save $200,000 to
$250,000 in operation costs annually.

What is a Biofilter?

The biofilter is a “living system” that treats odors
from the sewer and helps prevent corrosion. A fan
pulls air from the sewer and pushes it through an
engineered media — porous rock covered in a
thin layer of bacteria that breaks down unpleasant
odors in the air. Biofilter systems cost less than
other odor control methods, are easy to
maintain, and extend the life of the
sewer by reducing corrosion.

Funding

In 2014, the Alliance adopted a comprehensive Capital Plan that brings the partners’
facility assets, including the regional biofilter, under Alliance ownership. Costs for the regional biofilter are covered in the Capital Plan. In total, the project is anticipated to cost $1.2 million.

Construction Impacts

Traffic - Construction will take place in two locations along NE Salmon Creek Avenue: at the entrance of Liberty Bible Church, just east of the I-205 overpass; and at NE 127th Street. Work at each location is expected to last approximately one week.

Odor - During the acclimation and testing period (Winter of 2017–2018) fugitive odors may escape. Report any related odors to us via e-mail at adrienne@jla.us.com.